hi guys, if i change my aftermarket ecu in my gc8 to a second hand stock ecu from another car. will i need the key to be reprogrammed?

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If its an AUD WRX, yes.

Or change ignition barrell to suit key that goes with the stock ECU you are putting in.

Or fit a v5 sti ecu from a JDM car and you will not need to worry about the key. Patch has a v5 ecu JDM unit for sale in the forsale section. Worthy upgrade as well

will the v5 sti ecu direct plug into the 2000 wrx?

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so i put in a standard ecu without reprogramming and it worked fine

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Did you have to swap the cam & crank wires over?

If not it's a JDM ecu.

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[CENTER][COLOR=#ff0000]Built Ej207: Semi-closed RA Cases - Wiseco Forgies - Manley rods - BC 272 cams - GDA Heads - billet f/whl - Vi-pec - WbO2 - 800cc Yellow tops - TD05-20G - 409Hp ath @ 1.75bar on E85[/COLOR][/CENTER]

i ended up trying an adm ecu first and it worked. so i didnt have to fork out for the more expensive jdm unit

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Something is very odd about that,

But well done on getting it working!

ADM WRX ecu has an immobilizer

JDM WRX & STI ecu's do not.

if your car is starting then you have fitted a JDM WRX ecu (or an STI one)

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[CENTER][SIGPIC][/SIGPIC][/CENTER]
[CENTER][COLOR=#ff0000]Built Ej207: Semi-closed RA Cases - Wiseco Forgies - Manley rods - BC 272 cams - GDA Heads - billet f/whl - Vi-pec - WbO2 - 800cc Yellow tops - TD05-20G - 409Hp ath @ 1.75bar on E85[/COLOR][/CENTER]